Congrats to Chad King and Ian Axel, better known as A Great Big World, who land their third #1 song on my personal chart with “Younger”, up 3-1. Their longest run at the top so far was in 2014 with “Already Home”, which spent seven weeks there. A pack of three tracks break into the top ten this week, led by George Ezra‘s “Shotgun”, bouncing from 16-8. It recently became his first #1 song in the United Kingdom. This week’s Biggest Mover belongs to last week’s Highest Debut: “Come On To Me” by Paul McCartney, jumping ten spots from 38-28, though Lenny Kravitz‘s “Low” nearly ties that move, as it leaps nine spots from 30-21. The only debut in the top 40, starting at #37, is the radio single from the soundtrack to Mamma Mia! Here We Go Again. Just under the top 20 on the AC chart, “Fernando”, a cover of Abba‘s 1976 AC and CHR hit, is done by two of the film’s stars: Cher and Andy Garcia. At 72, Cher is the second-oldest female performer to ever make my list, just behind Christine McVie, who was 74 when “In My World” (with Lindsey Buckingham) had its last two weeks in my top 40 last summer. The two acts involved, Abba and Cher, charted in the top 40 of the Hot 100 together just once during the summer of 1974, when the former was in with “Waterloo” and the latter was in with “Train Of Thought”.